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Density-controllable growth of SnO2 nanowire junction-bridging across electrode for low-temperature NO2 gas detection

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Abstract

The junction-bridging structure of metal oxide nanowires (NWs) improves gas-sensing properties. In this study, an on-chip growth method was used to fabricate gas sensors, it easily and effectively controls NW junctions. SnO2 NWs were synthesized by thermal evaporation at 800 °C with tin powder as the source. The density of the NW junctions was controlled by changing the mass of the source material. A source material with large mass yielded high-density NW junctions. With electrode spacing of 20 μm, NW junctions were formed from the source material of larger than 2 mg. Gas sensing results revealed that the junction sensors exhibited a good response to NO2 gas at a concentration of 1–10 ppm. The sensors exhibited a good response to NO2 gas at low temperature of up to 100 °C and short response–recovery time (~20 s). The sensors also had good selectivity to NO2 gas. The response (R gas /R air) to 1 ppm NO2 was as high as 22 at 100 °C, whereas the cross gas responses (R air /R gas) to 10 ppm CO, 10 ppm H2S, 100 ppm C2H5OH, and 100 ppm NH3 were negligible (1.1–1.3).

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Acknowledgements

This study was financially supported by the National Foundation for Science and Technology Development project of Vietnam (code 103.02-2011.46).

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Authors and Affiliations

  1. International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), Hanoi, Vietnam

    Dang Thi Thanh Le, Nguyen Van Duy, Ha Minh Tan, Do Dang Trung, Phung Thi Hong Van, Nguyen Duc Hoa & Nguyen Van Hieu

  2. School of Engineering Physics (SEP), Hanoi University of Science and Technology (HUST), Hanoi, Vietnam

    Nguyen Ngoc Trung

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  1. Dang Thi Thanh Le
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  2. Nguyen Van Duy
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  3. Ha Minh Tan
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  4. Do Dang Trung
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  5. Nguyen Ngoc Trung
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  6. Phung Thi Hong Van
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  7. Nguyen Duc Hoa
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  8. Nguyen Van Hieu
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Correspondence to Nguyen Van Duy or Nguyen Van Hieu.

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Le, D.T.T., Van Duy, N., Tan, H.M. et al. Density-controllable growth of SnO2 nanowire junction-bridging across electrode for low-temperature NO2 gas detection. J Mater Sci 48, 7253–7259 (2013). https://doi.org/10.1007/s10853-013-7545-9

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  • DOI: https://doi.org/10.1007/s10853-013-7545-9

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